In situ reduction of refined attapulgite for advanced oxidative degradation of sulfadiazine
Low-grade iron-containing attpulgite(APT)from Baiyin,Gansu was treated by dry and wet integrated dissociation technique to produce modified and refined attapulgite(SAPT),which was further reduced by hydrogen through a high-temperature in-situ reduction method to synthesize in-situ reduced attapulgite(HAPT).HAPT was characterized by XRF,XRD,FTIR,SEM and TEM,and analyzed for its degradation performance on sulfadiazine(SDZ),one kind of antibiotics,in the presence of potassium persulfate(PDS).The effects of HAPT dosage,PDS concentration,SDZ initial mass concentration,initial pH and reaction temperature on the degradation rate of SDZ were further investigated.The results demonstrated that under the conditions of HAPT dosage 2.0 g/L(based on the volume of the initial solution of SDZ,the same below),PDS concentration 3.6 mmol/L,initial pH 3,and reaction temperature 30℃,the degradation rate of SDZ with an initial mass concentration of 10 mg/L by HAPT/PDS system reached 96.8%within 240 min.Electron paramagnetic resonance and active species capture experiments showed that the main active species in the HAPT/PDS system were sulfate radicals and hydroxyl radicals,with sulfate radicals playing a dominant role.
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